FY 2015 Lake Quinault Nutrient Enrichment

Salmonid Habitat Restoration and Acquisition

Water Quality
Project ID15-QUIN-02
Recovery Domains -
Start Date07/01/2016
End Date09/01/2017
Last Edited05/08/2024
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The project elements funded by the grant included 1) fertilizing Lake Quinault with liquid nitrogen and phosphorus fertilizers; 2) monitoring of a suite of physical, biological, and chemical variables relevant to lake nutrient enrichment effectiveness monitoring (Ashley & Stockner 2003); 3)data entry, data QA/QC, and database management; and 4) equipment maintenance/repair and operating expenses. The nutrient prescription is intended to enhance production of edible phytoplankton and zooplankton, the food source of sockeye fry, while avoiding the occurrence of nuisance algae responses. The prescribed nutrient load was developed and then applied weekly by boat from April to October to the epilimnion of Lake Quinault through application of liquid fertilizers urea-ammonium nitrate (32-0-0) and ammonium polyphosphate (10-34-0). The monitor is designed to measure sentinel variables that enable scientists to identify changes in the production cycles of the lake (Stockner 1981, 1987, Shortreed and Stockner 1985). This information chronicled changes in abundance and biomass of major plankton components. Shifts in abundance of species and/or assemblages will signal changes in production, carbon flow, and the food web. The monitor will also provide data to identify physical influences that impact lake productivity (e.g. turbidity influence on euphotic zone depth).

Project Benefit    

The project benefits (objectives) are 1) supplement natural nutrient loads to Lake Quinault and 2)improve trophic level productivity and lake carrying capacity for sockeye fry. Increased primary productivity is the most consistent measure of nutrient supplementation response in lakes. The prescribed nutrient load is equivalent to a yield of 0.6 ug/L chlorophyll a biomass. QIN will analyze and evaluate the data collected to identify seasonal productivity and report the trophic state of Lake Quinault.


Metric Completed Originally

Funding Details

Report Total:$129,662

Project Map


Lake Quinault    

  • Worksite Identifier: Lake Quinault
  • Start Date: 01/01/2016
  • End Date: 12/31/2017
Area Description

No Area Description data was found for this worksite.

Location Information

  • Basin: Washington Coastal (171001)
  • Subbasin:
  • Watershed:
  • Subwatershed:
  • State: Washington
  • Recovery Domain:
  • Latitude: 47.470114647433355
  • Longitude: -123.86924743652052


  • Quinault Lake Sockeye Salmon ESU




  • C.0 Salmonid Habitat Restoration and AcquisitionY (Y/N)
    •      . . C.0.a Habitat restoration and acquisition funding 129,662.00
    •      . . C.0.b Length of stream treated/protected 5.40
    •      . . C.0.c
      Project identified in a Plan or Watershed Assessment
    •      . . C.0.d.1 Project Monitoring (LOV)
    •      . . C.0.d.2 Monitoring Location (LOV)
    •      . . C.7 Water Quality ProjectY (Y/N)
      •      . . . . C.7.a Water quality funding 129,662.00
      •      . . . . C.7.b.1 Total acres of area treated for water quality 3,700.0
      •      . . . . C.7.b.2 Total acre feet of water treated for water quality3700 (Acre feet)
      •      . . . . C.7.c Water Quality Limitation Treated (LOV)
      •      . . . . C.7.g.1 Carcass or nutrient placementY (Y/N)
        •      . . . . . . C.7.g.2 Select the type of nutrient used (LOV)
        •      . . . . . . C.7.g.3 Pounds (Lbs) of carcasses, fish meal bricks, analog or other fertilizer placed in or along stream39060 (lbs)
        •      . . . . . . C.7.g.5 Miles of stream treated with nutrients 5.40